Which stage of labor is defined as the onset of regular contractions to complete dilation?

Which stage of labor is defined as the onset of regular contractions to complete dilation?

• A. Second stage of labor
• B. Third stage of labor
• C. Fourth stage of labor
• D. First stage of labor

Answer: (D)

Stage I of labor is defined as the interval from the onset of regular contractions to complete dilation of the cervix (10 cm). During this stage the cervix gradually effaces and dilates to allow the baby to pass, encompassing the early, active, and transition phases as contractions become stronger and more regular. The key boundary is reaching full dilation, after which the next stage begins with the birth of the baby. The other stages are different: once the cervix is fully dilated, delivery of the baby marks the start of the second stage; the third stage ends with placental delivery; and the fourth stage refers to the immediate postpartum recovery period. So the description fits the first stage.

Stage I of labor is defined as the interval from the onset of regular contractions to complete dilation of the cervix (10 cm). During this stage the cervix gradually effaces and dilates to allow the baby to pass, encompassing the early, active, and transition phases as contractions become stronger and more regular. The key boundary is reaching full dilation, after which the next stage begins with the birth of the baby. The other stages are different: once the cervix is fully dilated, delivery of the baby marks the start of the second stage; the third stage ends with placental delivery; and the fourth stage refers to the immediate postpartum recovery period. So the description fits the first stage.